Step 6: Finishing

Step 7: Testing

-Take your cellphone and place it in the wallet and call it while holding the top of the wallet closed. If it doesn't ring the wallet probably works! ...

RFID has been used in stores and cars as a identification system for years. They seem to make life in general more efficient.

With RFID tags in Credit Cards, Passports, and drivers licenses coming out I started to worry. Soon there will be RFID tags in money. I guess that would help solve some of the poverty problems. RFID tags are also not very secure. When the first RFID passports came out in the UK the encryption on the chips was broken in under 48 hours!

Step 1: Materials

Step 2: Make the Base

-Make 2 sheets of ducktape that are 19.5cmx16cm, sticky side up, by overlapping the strips of ducktape as shown.
-Cut 2 pieces of 17.5cmx14cm aluminum foil. Place them on each sheet of ducktape.
-Put 3 strips of double sided tape on one of the sheets of aluminum foil/ducktape.
-Put the two sheets together like a sandwitch sticky side in.
-Trim it so it looks good.
Your done with the base!

Step 3: Make the Money Pocket

-Fold the base in half like a hot dog (see picture) leaving about a centimeter of no overlap at the top.
-Tape the sides

Your done with the money pocket. Now we will add the change holder and the ID.

Step 4: Change Holder

-Take 2 pieces of ducktape one slight bigger than the other and place them together, sticky side in. The smaller one should be equal in size to half the wallet lengthwise.
-Take this a place it on the left side of your wallet.

hopefully i am not displaying my ignorance of physics and manufacturing but is there any polarization effect if you rotate the pieces of foil - will this increase the efficacy or is this just a waste of foil?

An OK idea for the seriously broke or cheap. However the downside of using any tape, inc. duct tape (not 'duck', mercy on our billed cousins!) for a permanent 'fix' is that after a while the glue comes off and leaves very hard to remove deposits on whatever it touches (inside your back pocket in this case). I know this from sad experience. Better off buying a purpose-made shielding wallet, card pouches, or in-wallet RFID jammer such as ArmourCard.

I recently did some research on this as my wife got skimmed, I found this cool product made in Australia called Armourcard, it jams RFID signals and fits in a wallet. Pretty cool we both have one now. http://www.armourcard.com.au/

The electric wave from the electromagnetic field would induce a current in a conductive material. This current would cause the conductive material to become magnetic by aligning the magnetic domains. However, fridge material is probably not conductive at the frequency of light. again "MAGNETISM IS NOT ELECTROMAGNETISM" Electromagnetism is were a changing magnetic wave that produces a electric field that then produces an magnetic field. A permanent magnet only produces an unchanging magnetic field.

thats because the magnet disturbs the atomic particles in the wire causing electrons(or protons cant remember which) to flow in the wire generating electricity which then powers the light. Just read up on generators and how they work

No, RFID = electromagnetic waves light is electromagnetism, radio waves, microwaves, X-rays.... pretty much any "wave" is electromagnetism. so yes, tinfoil may spot alot of these, It depends on the electron configuration.

It's called AlFoil. Cheap, suitable, able to shape into a helmet XD. Not sure about brass but aluminum foil is well known on instructables for blocking/boosting signals. Also, you can get Aluminium foil/tape which may be more convenient. Nice instructable *Votes*

"Probably works" ... nice. Going to Defcon this year, gonna have to make these. Nice job BTW! I would have loved to see you put more work into the design of the wallet, like the all of the other duct tape wallets out there.

I did not get the idea from this site, I got the idea of using tin foil from wikipedia and did the rest myself. I don't understand why you are calling me a newby. I am not to late. The one on i-hacked looked bad because it had tinfoil showing and they did not even come up with a way of testing it.

Tin foil show is what makes it better because otherwise it would just look like a duck tape wallet. Also shiny stuff is awesome.

Secondly you must be totally blind because the one on I-Hacked DID test it, read the second paragraph

"It seemed to be pretty well known online that aluminum foil prevented the transmission of RFID signals. 'A quick test at my work place using my badge confirmed this.' The next step was to design a wallet with aluminum foil embedded inside. Using the plans to make Duct Tape Wallets I created previously, it was simple to modify them to include the aluminum foil."

ACTUALLY, The US Army adapted duct tape from HVAC or some other duct worker during WWII because they needed tough water resistent tape. First it was duct, then it adapted duck. Don't you love it when we are all right? :)

No, no, no. You're all only half-right. The US Army needed a waterproof tape for sealing munition boxes. Johnson and Johnson added a waterproof layer to some of their medical tape and the army was good to go. It was called "duck tape" because it was waterproof. When the war ended, the people doing HVAC work started to use it to repair gaps and fix seams. They coloured it grey to blend in with the HVACs. At this point it was re-named "duct tape" because it was used on ducts. So either work, but "duct" is a bit nicer than "duck" because people know that you're talking about the type of tape in general, and not duck brand duc-k/t tape.

hmmmmmmmm your right actually... here you go anyways Duct tape (sometimes called duck tape; see under Etymology) is a vinyl, fabric-reinforced, multi-purpose pressure sensitive tape with a soft and tacky pressure sensitive adhesive. It is generally silver or black in color but many other colors and transparent tapes have recently become available. With a standard width of 17⁄8 inches (48 mm), duct tape was originally developed during World War II in 1942 as a waterresistant sealing tape for ammunition cases.[1][2] Permacel, then a division of Johnson & Johnson, used a rubber-based adhesive to help the tape resist water and a fabric backing to add strength. It was also used to repair military equipment quickly, including jeeps, guns, and aircraft because of these properties. In Canadian military circles, this variant is known as "gun-tape", typically olive-green, and also known for its resistance to oils and greases. Duct tape is also called "100-MPH tape" in the military [3], because soldiers often refer to something that exceeds expectations as "High Speed." After WWII, the housing industry boomed and people started using duct tape for many other purposes. The name "duct tape" came from its use on heating and air conditioning ducts, a purpose for which it, ironically, has been deemed ineffective. Its strength, low cost, and remarkable versatility make it a household staple throughout North America and Europe for temporary repairs and general-purpose use. THERE, solid proof...

Cotton duck is a heavy, tightly woven, cotton fabric (generically referred to as canvas) . This is the fabric that is in DUCK tape... and is, in fact why it's called duck tape. The name comes from from the Dutch word doek meaning a linen canvas which was used for sailors' clothing. This usage predates both WWII and central heating. Just as with the fabric the tape a tighter weave and higher thread count equals a heavier, stronger, higher quality product. Call it by either name and people will know what you're talking about... and argue :)

I'm going to have to try and make one of these, along with a mobile phone sock containing Tin Foil (I'm sure my blasted phone is still sending out signals even when it's turned off). :D Thanks for the Instructable.

why not make the same thing without tinfoil and make the outer opening layers a pouch and put a bunch of lead shot in there... it may be heavier but it'll protect you from those darn X-rays at the airport.

wal-mart, near the paint.......all kinds of colors.......or the huntin/ sporting goods isle...i wanted blaze orange figured they'd have it with the other orange hunting appearal, nope,camafloge not orange go figure, but they did have it in the duct tape isle....even had purple....not sure what u'd use purple duct tape for but i got some anyway.....LOL btw they do make a tinfoil type tape also......not sure if that would work or not......

Huh, I guess I'm not the only one who has thought of this. I never figured to use a phone to test if it locks radio waves though. Are you sure RFID and GSM operate on similar enough frequencies for that test to be reliable?

Depends on the tag, some tags operate closer to GSM frequencies others don't. For example the "EM-4001" compliant tags run at 125kHz GSM runs in the GHz band. (near microwaves) as does bluetooth, wifi etc

This is a good think. When RFID credit cards came out I thought, "someone's just going to walk through a crowd with a portable RFID scanner hidden in something and steal data like crazy." I'm just not going to have an RFID card, but this is still great for those that must have it.

hey comeon, why do you people hate this idea? i like it, and it's cool in my opinion so honestly, stop being buttheads about it. Also cheese boy, aluminum foil should be covered for aesthetical reasons and such.

There's a chance that since rating will be part of winning this contest, some others in the contest are giving out negative ratings. We'll do a check and make sure this isn't the case as we know record who gives each rating.